The advantages of using quarterly returns for long-term event studies

被引：5

作者：

Bremer R. ^{[1
]}

Buchanan B.G. ^{[2
]}

English II P.C. ^{[3
]}

机构：

[1] Department of Information Systems and Quantitative Studies, Rawls College of Business, Texas Tech University, Lubbock

[2] Department of Finance, Albers School of Business, Seattle University, Seattle, WA 98122-1090

[3] Department of Finance and Real Estate, Kogod School of Business, American University, Washington, DC 20016-8044

来源：

Review of Quantitative Finance and Accounting | 2011年 / 36卷 / 4期

关键词：

Long-horizon performance studies; Matching characteristics;

D O I：

10.1007/s11156-010-0191-2

中图分类号：

学科分类号：

摘要：

The main purpose of this paper is to explore the low power and methodological problems as they continue to plague long-term event study research. We investigate long-term tests (up to 2 years) performed on non-overlapping quarterly time frames as a solution. Components of commonly employed characteristic-based matching processes are examined as the source of low power. Single "best" matching firms don't statistically match their event firms at the time of the event and are vastly inferior to matching with portfolios. A modified market mean method which uses the securities continuously traded during the calendar event period, is shown to be well specified, have comparable power and avoid the costs of more complex matching methodologies. Contrary to popular perception, increased power derives from the decreased variance in comparison returns; not from an increased covariance between comparison firm returns and event firm returns. The tests are easy to implement, well-specified and have higher power when based on quarterly versus monthly data. © 2010 Springer Science+Business Media, LLC.

引用

页码：491 / 516

页数：25

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